Among bikers 666 represents the 6th letter of the alphabet. Stands for FFF - Filthy Few Forever. Originated by (?) the Hells Angels and was used for it's shock value as society correlated it with being the "Number of the Beast".

Some 1% bikers wear the 666 patch to indicate they are "pure evil" and have done many things society would view as "evil". They are generally "the baddest of the bad".

The Mark of the beast, and the men who follow the beast of the earth will bear this mark to display their allegiance to the beast. It has been disputed by some scholars that certain numeric ciphers would translate it over to certain words, names, etc... For example, one of the more popular translations was Nero Caesar, and before that, Lateinos, etc...

"...And that number is 666."

Widely implied that it was 666 because it was an imperfect number to represent the impurities of man and their evildoings and sinful ways.

Read the book of revelations, at the end of the New Testament; it tells all about that, the seven seals, the apocalypse, Armageddon, Megiddo, etc...

666 is NOT the number of Satan. 666 is best described as a number of lawlessness, secularity, atheism, and sin - all things which many members of the human race indulge in. Emblazing the numbers "666" on your skin or affixing it to your screen name does not make you a Satanist - it makes you look like a fucking retard!